of int.

Problem:    Using taglist() on a tag file with duplicate fields generates an
            internal error. (Peter Odding)
Solution:   Check for duplicate field names.

Problem:    Copy/paste with OpenOffice doesn't work.
Solution:   Do not offer the HTML target when it is not supported. (James
            Vega)

Fixed MSVC makefile use of /Wp64 flag.

Problem:    When using ":earlier" undo information may be wrong.
Solution:   When changing alternate branches also adjust b_u_oldhead.